LatticeECP2/M: What is the difference between Quad Based Protocol Mode and Channel Based Protocol Mode?
When in Quad Based Protocol Mode, the four channels in the same quad will be configured to the same
rate -- either full-data-rate mode(Reference
Clock Multiplier set to 10X or
20X)
or half-data-rate mode(Reference
Clock
Multiplier set to 10XH or
20XH). In this
case the Reference Clock Multiplier can be
set to 10XH, 10X or 20X. When in Channel Based Protocol Mode, at least two channels should be enabled, although all the enabled channels in a same quad can be configured independently to either
full-data-rate mode or half-data-rate mode, the two rate modes should both be used.